Metronome

A mechanical metronome uses an adjustable weight on the end of an inverted pendulum rod to control tempo. The weight slides up the pendulum rod to decrease tempo, or down to increase tempo.[20] (This mechanism is also called a double-weighted pendulum, because there is a second, fixed weight on the other side of the pendulum pivot, inside the metronome case.) The pendulum swings back and forth in tempo, while a mechanism inside the metronome produces a clicking sound with each oscillation. Mechanical metronomes do not need a battery, but run from a spring-wound clockwork escapement.

Electromechanical metronomes were invented by Franz Frederick.[21] Instead of using a clockwork or a quartz crystal, an electric motor is used to generate power for the mechanism. Most use a mechanical variable-speed drive combination with a momentary switch and a cam wheel to time the beats. Franz and Yamaha were common manufacturers in the 1960s and 1970s, such as the Franz LB4. A common optional feature was a neon lamp which lights up in time with the beat. Very few electromechanical metronomes provide time signature chimes in addition to the basic tempo.

Electronic metronome, Wittner model

Most modern metronomes are electronic and use a quartz crystal to maintain accuracy, comparable to those used in wristwatches. The simplest electronic metronomes have a dial or buttons to control the tempo; some also produce tuning notes, usually around the range of A440 (440 hertz). Sophisticated metronomes can produce two or more distinct sounds. Tones can differ in pitch, volume, and/or timbre to demarcate downbeats from other beats, as well as compound and complex time signatures.

Many electronic musical keyboards have built-in metronome functions.

Software metronomes run either as standalone applications on computers[22] and smartphones, or in music sequencing and audio multitrack software packages. In recording studio applications, such as film scoring, a software metronome may provide a click track to synchronize musicians.

Users of iPods and other portable MP3 players can use prerecorded MP3 metronome click tracks, which can use different sounds and samples instead of the usual metronome beep. Users of smartphones can install a wide range of metronome applications. The Google search engine includes an interactive metronome that can play between 40 and 218 BPM.[23] Either method avoids the need to bring a physical metronome along to lessons or practice sessions.

The metronome is usually positively viewed by performers, musicologists (who spend considerable time analysing metronome markings), teachers, and conservatories. It is considered an excellent practice tool because of its steady beat, being "mathematically perfect and categorically correct".[28] This removes guesswork and aids musicians in various ways, including keeping tempos, countering tendencies to slow down or speed up, and increasing evenness and accuracy, especially in rapid passages. Metronomes are thus commonly used at all skill levels—both by students and professional musicians.[29] Likewise, the use of the metronome is valued in learning various genres with various tempos, but may not be sufficient for more complex rhythms. Nevertheless, the steady tempo (that helps identifying when one is playing offbeat) is hailed as an invaluable resource; in his doctoral thesis, Aaron M. Farrell described the metronome as a "perfect chamber music partner".[28] As a result, metronomes are often recommended to music students without reservation.[30][31]

Various quotations in favour of the metronome can be found in the book Metronome Techniques: Potpourri of quotations.[32]

The metronome has been very important in performance practice, and largely unquestioned in musical pedagogy or scholarship, since the 20th century.[33] Author Miles Hoffman said that "most music teachers consider the metronome indispensable, and most professional musicians, in fact, continue to practice with a metronome throughout their careers".[29]

Author Bruce Haynes describes the role of the metronome in modern style in detail in his book The end of early music, for metronomic practice is now common worldwide.[34] He emphasizes that modern style is much more rhythmically rigid, in that tempo is steady and scores are read very literally, sometimes perceived as devoid of emotion in contrast to the rubato and bluster characteristic of Romantic music. Because of this, American musicologist and critic Richard Taruskin calls Modernism "refuge in order and precision, hostility to subjectivity, to the vagaries of personality," noting its order and precision.[34] These qualities give rise to the term metronomic, which critics use to describe modern performances with an unyielding tempo, mechanical rhythmic approach, and equal stress to all subintervals; American violinist Sol Babitz considered it "sewing machine" style with limited flexibility.[35] American musician Robert Hill also commented on the predictably regular beat characteristic of Modernism; he describes a trade-off, in that "we compensate our lack of timing flexibility by a very highly developed sense of tone-color and dynamic which, however refined and polished it may be, tends to abstract and de-personalize the music-making, underscoring its absoluteness". He also notes this as having changed greatly from the "standard" classical repertoire of the 19th century.[36]

In the early 19th century, the metronome was not used for ticking all through a piece, but only to check the tempo and then set it aside. This is in great contrast with many musicians today, who use the metronome in the background for the entirety of a piece of music.[37]

Some writers draw parallels between a modern society that is "ordered by the clock" and what they see as metronomic performance practice of today's musicians.[7][33][38]

While this section highlights the modern trends of strict mechanical performance as something widespread in the 20th century and now, as early as 1860, some people advocated this type of "modern" performance practice.[39] While some in the 19th century welcomed the metronome,[40][41] others were critical (see below).

One of the underlying reasons for much early criticism may have been the fact that unlike traditional Italian tempo indications, metronome marks indicate a highly specific tempo, and are not easily reinterpreted in the way that the traditional Italian tempo indications are. Changes in aesthetics or in the instruments themselves can easily make speeds indicated earlier problematic,[42] which may explain why many notable nineteenth-century composers including Felix Mendelssohn, Richard Wagner, Giuseppe Verdi, and Johannes Brahms criticized use of the metronome.[43]

A metronome only provides a fixed, rigid, continuous pulse. Therefore, metronome markings on sheet music provide a reference, but cannot accurately communicate the pulse, swing, or groove of music. The pulse is often irregular,[44] e.g., in accelerando, rallentando, or in musical expression as in phrasing (rubato, etc.).

Some argue that a metronomic performance stands in conflict with an expressive culturally-aware performance of music, so that a metronome a very limited tool in this respect. Even such highly rhythmical musical forms as samba, if performed in correct cultural style, cannot be captured with the beats of a metronome; the steady beat of a metronome neglects the characteristic swing of samba.[45][46] A style of performance that is unfailingly regular rhythmically might be criticized as being metronomic.

Others argue that the metronome has no musical value, instead costing creativity and hurting the sense of rhythm in musicians rather than helping it. The use of a metronome has been compared to the difference between mechanically-aided and freehand drawing, in that the output with a metronome is said to be rigid and lacking creativity.[47] Similarly, the controllable constant speed and rigid repetition of a metronome has been described as possibly costing internal rhythm and musicality when abused or overused.[48] This contrasts with those who advocate its use as a training tool and exercises to cultivate a sense of rhythm.

American composer and critic Daniel Gregory Mason wrote that the use of the metronome is "dangerous" because it leads musicians to play by the measure or beat instead of the phrase, at the expense of liveliness, instinct, and rhythmical energy. He references that "good performances" commonly feature retardations and accelerations, in contrast to the steady beat of a metronome.[49] This opinion has also been expressed by music teachers; for example, teacher Jennifer Merry relates the steady beat of a metronome to the structure of contemporary popular music, and says that both factors hinder understanding of rhythm and tempo in young children.[50] These criticisms emphasize the importance of intuition, nuances, and style, rather than the rigid, steady beat of a metronome.

The basic skill required is the ability to play precisely in the pocket—that is, exactly on the click of the metronome[54]—with the metronome in a relaxed fashion. It helps musicians instil a more accurate sense of time clearly and precisely, at intervals corresponding to fractions of a second. One challenge with this approach, especially for pianists and percussionists, is the metronome click seeming to vanish (or at least be heard less distinctly) when one hits the click exactly. Musicians who attempt to play in the pocket with a metronome without established technique may find that it introduces tension and effort into their instrument technique.

To address these difficulties, musicians start by learning to play consistently ahead or behind the beat whenever they want to. As a result, they develop a clear sense of "where the click is" and can train to hit the click as well.

Musicians also listen to how the sound of their playing merges with the metronome to create a new sound when playing precisely in the pocket. Various approaches suggest that by listening in this way (and through other exercises), it is possible to play precisely in the pocket with the metronome in a relaxed fashion.[55][56][57][58] While learning how to play in the pocket, musicians also work on flexibility and the ability to play precisely anywhere in the beat (as in more complex rhythms).

Much of modern metronome technique involves various methods to help resolve timing problems. It aims to encourage and develop a clear sense of musical time and to help with the nuances and precision of timing, but at the same time must avoid creating overdependence on the metronome. Many exercises are used to help with precision of timing and sensitivity to time, such as maintaining the beat (staying in time) while the metronome is silent for longer periods of time,[59] and playing displaced clicks[60] or polyrhythms over the metronome.

Modern metronome technique addresses expressive musical rhythms in many ways. For instance, much of the focus of modern metronome technique is on encouraging and developing a solid sense of tempo and timing, in both thinking and playing; as a result, one will be more rhythmically conscious.

Special metronome exercises are used to help keep this fluid sense of rhythm and timing when working with the metronome. Some commonly referenced exercises include drifting gradually from one beat to the next, playing beats ahead or behind the click (to become comfortable with playing anywhere relative to the metronome click), and starting from a pulse unison before gradually pushing notes ahead of the click and then pulling back again to pulse unison (or conversely, first pulling behind the pulse).[61]

Author Andrew Lewis stated that one can also develop a higher level of awareness of the many natural rhythms in their everyday life, and use exercises to help bring those rhythms into their music.[62] Likewise, author Mac Santiago emphasizes that use of a metronome helps to improve one's sense of time and exact timing without causing any of the expected problems for musicality and expressive timing, and rhythm itself is natural to human beings (though an exact sense of the passage of time is not) but must be trained for use in music. Santiago's book states:

Time Feel, the subject of Chapter 7, is one of the great keys to musicality for rhythm section instruments. But being able to play behind or ahead of the pulse can also add expression to a melodic line. This, along with slight changes in dynamics, creates phrasing in music. The ability to hear the pulse and yet accelerate or decelerate slightly is a great way to incorporate human feeling into a musical performance. Of course, this is all relative to the tempo, and is best achieved relative to a steady tempo. In other words, the more definite your sense of pulse, the better your capability to manipulate it. This also works for the actions of ritardando and accelerando, as they are relative to a steady pulse and are best performed gradually rather than in sudden shifts"[63]

Lewis also says in his book that increasing sensitivity to rhythm is essential to develop greater precision of timing and a clearer sense of the passage of musical time—relative to which musicians can then use expressive, natural and fluid rhythms, with as much rubato and tempo variance as they wish for. Lewis' book states:

Rhythm is everywhere. Be sensitive to it, and stay aware of spontaneous occurrences that can spur rhythmic development. Listen all the time and use your imagination. Become a rhythm antenna.[64]